openfimg: compiler: Dump SSA data after optimization stage

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Implement interference graph construction

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Add node list helpers

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Partially implement live range splitting

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>